How to Change JOptionPane font

Use JTextArea component to render in JOptionPane.
Example:
JTextArea txtArea = new JTextArea(errMsg);
txtArea.setFont(GuiUtils.getThaiFont(Font.BOLD, 22));
txtArea.setOpaque(false);
txtArea.setEditable(false);
txtArea.setBorder(BorderFactory.createEmptyBorder(10, 10, 10, 10));
JOptionPane.showMessageDialog(this, txtArea);